初始化

lib/pages/teacher/room/view/waiting_start.dart

@@ -0,0 +1,80 @@
+import 'dart:async';
+
+import 'package:app/utils/time.dart';
+import 'package:flutter/material.dart';
+
+class WaitingStart extends StatefulWidget {
+  const WaitingStart({super.key});
+
+  @override
+  State<WaitingStart> createState() => _WaitingStartState();
+}
+
+class _WaitingStartState extends State<WaitingStart> {
+  ///剩余秒
+  int _seconds = 0;
+  Timer? _timer;
+
+  @override
+  void initState() {
+    super.initState();
+    startCountDown();
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    _timer?.cancel();
+    _timer = null;
+  }
+
+  ///开始倒计时
+  void startCountDown() {
+    //当前时间
+    DateTime now = DateTime.now();
+    //远端时间
+    DateTime remote = DateTime.parse("2025-11-19 17:10:00".replaceFirst(' ', 'T'));
+    setState(() {
+      _seconds = remote.difference(now).inSeconds;
+    });
+    _timer = Timer.periodic(Duration(seconds: 1), (timer) {
+      setState(() {
+        _seconds--;
+      });
+      if (_seconds <= 0) {
+        _timer?.cancel();
+        _timer = null;
+        _start();
+      }
+    });
+  }
+
+  ///倒计时结束开始
+  void _start() {}
+
+  @override
+  Widget build(BuildContext context) {
+    return Align(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Text(
+            "未到开播时间，到点后自动开播",
+            style: TextStyle(color: Colors.white),
+          ),
+          Container(
+            margin: EdgeInsets.symmetric(vertical: 10),
+            child: Text(
+              formatSeconds(_seconds),
+              style: TextStyle(
+                color: Colors.white,
+                fontSize: 26,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}